Efficient and economical electrocatalysts should be developed for oxygen evolution reaction(OER)and hydrogen evolution reaction(HER)to split water for an extensive application prospect of green and clean hydrogen ener...Efficient and economical electrocatalysts should be developed for oxygen evolution reaction(OER)and hydrogen evolution reaction(HER)to split water for an extensive application prospect of green and clean hydrogen energy.Here,we develop highly efficient OER and HER electrocatalysts through the scalable fabrication of Ni Fe Zn hydroxide nanosheets firmly arrayed on a hierarchical porous intermetallic Ni Zn and Ni heterojunction over nickel foam(Ni Fe Zn-OH/Ni Zn-Ni/NF).One bimodal porous Ni Zn intermetallic/Ni layer is in situ constructed on the nickel foam surface to maximize the exposure of catalytic sites and build firm Ni Fe Zn-OH nanosheets via the redox reaction with Fe Cl;.Ni Fe Zn-OH/Ni Zn-Ni/NF shows low overpotentials of?50/600 around 235/284 m V for OER and?50/600 around73/212 m V for HER,small Tafel slopes of 46.1 and41.1 m V dec^(-1),and prolonged catalytic durability in an alkaline medium because of the strong synergistic effects of Zn doping,multiple interface engineering,and integral threedimensional free-standing scaffold.As bifunctional catalysts,Ni Fe Zn-OH/Ni Zn-Ni/NF required a low electrolytic voltage of1.49 V at 20 m A cm^(-2)(1.61 V at 100 m A cm^(-2))with a sustained and stable output for 40 h during water splitting.This work might provide insights into the exploration of low-cost and highly efficient intermetallic/multimetallic hydroxide heterostructured electrocatalysts for practical overall water splitting.展开更多
基金supported by the National Natural Science Foundation of China(51772133)the Natural Science Foundation of Shandong Province(ZR2017JL022)+1 种基金the project of“20 Items of University”of Jinan(2018GXRC001)the Case-by-Case Project for Top Outstanding Talents of Jinan。
文摘Efficient and economical electrocatalysts should be developed for oxygen evolution reaction(OER)and hydrogen evolution reaction(HER)to split water for an extensive application prospect of green and clean hydrogen energy.Here,we develop highly efficient OER and HER electrocatalysts through the scalable fabrication of Ni Fe Zn hydroxide nanosheets firmly arrayed on a hierarchical porous intermetallic Ni Zn and Ni heterojunction over nickel foam(Ni Fe Zn-OH/Ni Zn-Ni/NF).One bimodal porous Ni Zn intermetallic/Ni layer is in situ constructed on the nickel foam surface to maximize the exposure of catalytic sites and build firm Ni Fe Zn-OH nanosheets via the redox reaction with Fe Cl;.Ni Fe Zn-OH/Ni Zn-Ni/NF shows low overpotentials of?50/600 around 235/284 m V for OER and?50/600 around73/212 m V for HER,small Tafel slopes of 46.1 and41.1 m V dec^(-1),and prolonged catalytic durability in an alkaline medium because of the strong synergistic effects of Zn doping,multiple interface engineering,and integral threedimensional free-standing scaffold.As bifunctional catalysts,Ni Fe Zn-OH/Ni Zn-Ni/NF required a low electrolytic voltage of1.49 V at 20 m A cm^(-2)(1.61 V at 100 m A cm^(-2))with a sustained and stable output for 40 h during water splitting.This work might provide insights into the exploration of low-cost and highly efficient intermetallic/multimetallic hydroxide heterostructured electrocatalysts for practical overall water splitting.
